Swisscard lite, use it all the time, particularly the scissors and pen. Just a bit thicker than a credit card.

I got a freebie version when I bought a leathman a few years back stopped carying it EDC as it's classed as a fixed blade

Got a little oppinel bug folder on my keys that gets some hammer...

Legal...... Says the man who walked past 2 coppers and a pcso with my Mora fixed blade high vis orange scabbard on my belt last night coming off the allotment one looked at me said good evening saw his eyes drop to the blade never said a word...

At 58mm long, a Swiss Signature Lite is always in my bag. It has a pen, small folding blade, scissors, nail file, 2.5 mm screwdriver and an LED.
Though it's soon to be replaced by a Victorinox Midnite Manager @ Work which has screwdriver, scissors, file, knife, bottle opener, wire stripper, Philips driver, pen, LED and 16GB USB 3. Perfect!

At 58mm long, a Swiss Signature Lite is always in my bag. It has a pen, small folding blade, scissors, nail file, 2.5 mm screwdriver and an LED.
Though it's soon to be replaced by a Victorinox Midnite Manager @ Work which has screwdriver, scissors, file, knife, bottle opener, wire stripper, Philips driver, pen, LED and 16GB USB 3. Perfect!

is it not the "Victorinox Jetsetter@work" you're making reference to here? I didn't think there was a version of the midnite with USB? if so post me a link please

AREA 8

It is no measure of health to be well adjusted to a profoundly sick society.

There's probably some of my friends who would say the smallest thing I use is between my ears but to answer the question I'd have to say my Swiss Army knife is the smallest most regularly used item. I do have a p38 tin opener on my key ring but I wouldn't say that falls into the used regularly catagory.

At 58mm long, a Swiss Signature Lite is always in my bag. It has a pen, small folding blade, scissors, nail file, 2.5 mm screwdriver and an LED.
Though it's soon to be replaced by a Victorinox Midnite Manager @ Work which has screwdriver, scissors, file, knife, bottle opener, wire stripper, Philips driver, pen, LED and 16GB USB 3. Perfect!

is it not the "Victorinox Jetsetter@work" you're making reference to here? I didn't think there was a version of the midnite with USB? if so post me a link please